JP2013202878A - Tire vulcanizing container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire vulcanizing container capable of reducing partial wear of a metal plate, when a segment attached to an outer peripheral surface of a sector mold is moved downward, and is slid and moved on a surface of a metal plate installed on a bottom plate.SOLUTION: A ball 7a projected from a surface of a metal plate 6 and biased is provided on a surface of a bottom plate 5 or the metal plate 6. When a segment 3 inclined to an annular center line CL of sector molds 11 which are arranged annularly moves down, a distal end of a bottom surface of the segment 3 abuts against the ball 7a to make the forward inclination of the segment 3 small, and the segment 3 is slid on the surface of the metal plate 6 by up/down movement of a container ring 2 to move each of the sector molds 11 forward and backward with respect to the annular center line C.

Description

  The present invention relates to a container for tire vulcanization, and more specifically, when a segment attached to the outer peripheral surface of a sector mold is moved downward and slid on a surface of a metal plate installed on a bottom plate. Further, the present invention relates to a tire vulcanizing container that can reduce uneven wear of a metal plate.

  The sectional type tire mold has a plurality of sector molds that are assembled in an annular shape and a pair of annular upper and lower side molds. The tire vulcanizing container in which the tire mold is installed includes a segment attached to the outer peripheral surface of each sector mold, a lifting plate to which the upper side mold is attached, a bottom plate to which the lower side mold is attached, It has a moving container ring. The segment is suspended from the elevating plate so as to be slidable in the horizontal direction, and the outer peripheral inclined surface of the segment and the inner peripheral inclined surface of the container ring are slidably engaged. Then, by the vertical movement of the container ring, the segments slide on the surface of the metal plate installed on the bottom plate, and the plurality of sector molds move forward and backward with respect to the annular center line (see, for example, Patent Document 1).

  In this type of tire vulcanizing container, the segment suspended from the lifting plate is inclined slightly forward depending on the play allowance with the lifting plate and the container ring and the position of the center of gravity of the segment. Therefore, when the elevating plate is moved downward to bring the segment into contact with the surface of the metal plate installed on the bottom plate, only the tip of the bottom surface of the segment is first brought into local contact. That is, at the start of mold closing of the tire molding, there is a portion on the surface of the metal plate that is locally slid against the tip of the bottom surface of the segment.

  The metal plate secures a predetermined vertical distance between the molds when the tire mold is clamped to prevent the rubber from overflowing from the mold. Therefore, when uneven wear occurs in the metal plate, rubber overflow tends to occur accordingly. Therefore, if uneven wear occurs in the metal plate, it must be replaced at an early stage, which increases the maintenance cost.

JP 2011-46069 A

  The object of the present invention is to reduce uneven wear of the metal plate when moving the segment attached to the outer peripheral surface of the sector mold downward and sliding it on the surface of the metal plate installed on the bottom plate. An object of the present invention is to provide a container for tire vulcanization that can be made to be made.

  In order to achieve the above object, a container for tire vulcanization according to the present invention includes a segment attached to the outer peripheral surface of each of a plurality of sector molds arranged in an annular shape, a lifting plate to which an upper side mold is attached, and a lower side mold. And a container ring that moves up and down, the segment is suspended from the elevating plate so as to be slidable in the horizontal direction, and an outer peripheral inclined surface of the segment and an inner peripheral inclined surface of the container ring are The segments are slidably engaged, and the segments are slid on the surface of the metal plate installed on the bottom plate by the vertical movement of the container ring, so that the plurality of sector molds are advanced and retracted with respect to the annular center line. In the tire vulcanizing container to be moved, the bottom plate or On the surface of the metal plate, an initial contact prevention member that protrudes upward from the surface of the metal plate and is urged is provided, and the segment that moves forward and tilts downward with respect to the annular center line is provided on the metal plate. Before the contact with the surface, the forward end of the segment is reduced by the tip of the bottom surface of the segment contacting the initial contact preventing member.

  Further, another tire vulcanizing container of the present invention is provided with a segment attached to the outer peripheral surface of each of a plurality of sector molds arranged in an annular shape, an elevating plate to which an upper side mold is attached, and a lower side mold. The segment is suspended from the lifting plate so as to be slidable in the horizontal direction, and the outer peripheral inclined surface of the segment and the inner peripheral inclined surface of the container ring are slidable. The segments are slid on the surface of the metal plate installed on the bottom plate by the vertical movement of the container ring to move the plurality of sector molds forward and backward with respect to the annular center line. In the container for tire vulcanization, the bottom plate or the metal An initial contact prevention member protruding above the surface of the metal plate is provided on the rate surface, and a guide groove extends on the bottom surface of the segment in a direction in which the segment moves forward and backward with respect to the annular center line. The segment is provided, and the guide groove has a portion whose groove depth is deepened in a direction in which the segment recedes with respect to the annular center line, and the segment moves downward while tilting forward with respect to the annular center line. Before the abutting against the surface of the metal plate, the tip of the bottom of the segment abuts against the initial contact prevention member to reduce the forward tilt of the segment, and the initial contact prevention member fits into the guide groove. And

  According to the tire vulcanizing container of the present invention, the tip of the bottom surface of the segment tilted forward before the elevating plate is moved downward to bring the segment into contact with the surface of the metal plate installed on the bottom plate. Contacts the initial contact prevention member. Therefore, it can prevent that only the front-end | tip part of the bottom face of a segment contacts the surface of a metal plate locally. Since the segment that abuts against the initial contact prevention member is corrected to the forward inclined state, even if the segment is slid on the surface of the metal plate due to the vertical movement of the container ring, the problem of uneven wear on the surface of the metal plate is suppressed. it can.

It is a half sectional view which illustrates the container for tire vulcanization of the present invention of a mold open state. It is a top view which illustrates the bottom plate and metal plate of FIG. It is a half sectional view which illustrates the container for tire vulcanization under mold closing. It is a half sectional view which illustrates the container for tire vulcanization of a mold clamp state. It is a longitudinal cross-sectional view which illustrates the ball | bowl which fits into a guide groove and a guide groove. It is a bottom view of the segment in which the guide groove was extended. It is a longitudinal cross-sectional view which illustrates the bottom face and bottom plate of the segment before mold closing. It is a longitudinal cross-sectional view which illustrates the bottom face and bottom plate of a segment at the time of a mold closing start. It is a longitudinal cross-sectional view which illustrates the bottom face and bottom plate of the segment which is moving forward toward the annular center line. It is a longitudinal cross-sectional view which illustrates the bottom face and bottom plate of the segment which is slidingly moved on the surface of the metal plate and moving forward. FIG. 7 is a partially enlarged view of FIG. 6. 12A and 12B are cross-sectional views illustrating how the guide groove and the ball are fitted, FIG. 12A is a cross-sectional view taken along the line AA in FIG. 11, FIG. 12B is a cross-sectional view taken along the line BB in FIG. The CC cross section of FIG. 11 is shown. It is sectional drawing which shows another illustration of the fitting condition of a guide groove and a ball | bowl, FIG. 13 (A) is AA cross section of FIG. 11, FIG. 13 (B) is BB cross section of FIG. C) shows a CC cross section of FIG. It is a longitudinal cross-sectional view which illustrates the protrusion fitted to a guide groove and a guide groove. It is a longitudinal cross-sectional view which illustrates the ball | bowl contact | abutted on the bottom face of the segment in which the guide groove is not extended.

  Hereinafter, the container for tire vulcanization of the present invention is explained based on the embodiment shown in the figure.

  As illustrated in FIGS. 1 and 2, a sectional type tire mold is installed in a tire vulcanizing container 1 of the present invention (hereinafter referred to as a container 1). The tire mold includes a plurality of (for example, about eight) sector molds 11 that are arranged in an annular shape to form a tire tread, and an annular upper side mold 12a and a lower side mold 12b that form tire sidewalls. .

  The container 1 includes a segment 3 attached to the outer peripheral surface of each sector mold 3, a lift plate 4 to which the upper side mold 12a is attached, a bottom plate 5 to which the lower side mold 12b is attached, and a container ring 2 that moves up and down. And. The elevating plate 4 and the container ring 2 are moved up and down by a hydraulic cylinder or the like. The outer peripheral surface of the segment 3 and the inner peripheral surface of the container ring 2 are inclined so as to spread downward toward the outer peripheral side.

  On the bottom plate 5, a plurality of metal plates 6 are annularly arranged with respect to the annular center line CL of the sector mold 3. In this embodiment, two metal plates 6 are arranged so as to correspond to one sector mold 3. Each metal plate 6 is detachably attached to the bottom plate 5 with screws or the like.

  The segment 3 is suspended from the lifting plate 4 so as to be slidable in the horizontal direction. The outer peripheral inclined surface of the segment 3 and the inner peripheral inclined surface of the container ring 2 are slidably engaged, and the segment 3 slides in the horizontal direction when the container ring 2 moves up and down. The segment 3 suspended from the elevating plate 4 is slightly tilted forward with respect to the annular center line CL. In this embodiment, the segment 3 is tilted forward at an angle a. In other words, the bottom surface of the segment 3 is inclined forward at an angle a with respect to the surface of the metal plate 6.

  As illustrated in FIG. 3, the segment 3 that has been moved downward and brought into contact with the metal plate 6 is slid on the surface of the metal plate 6 by moving the container ring 2 downward, so that each sector mold 11 is annular. It is configured to move forward with respect to the center line CL.

  As illustrated in FIG. 4, by moving the container ring 2 further downward and moving the sector mold 11 together with each segment 3 forward with respect to the annular center line CL, each sector mold 11 is assembled in an annular shape. Both are assembled with the upper side mold 12a and the lower side mold 12b, and the tire mold is clamped.

  A vulcanized green tire is installed on the lower side mold 12b. When taking out the vulcanized tire, the procedure reverse to the procedure of clamping the tire mold is performed.

  As illustrated in FIG. 5, a metal ball 7 a is provided on the surface of the metal plate 6 and protrudes upward from the surface of the metal plate 6 and is urged. The ball 7 a is an initial contact preventing member that prevents only the tip of the bottom surface of the segment 3 tilted forward from locally contacting the surface of the metal plate 6.

  In this embodiment, a hole 5 a is formed in the bottom plate 5, and a through hole 6 a is formed in the metal plate 6. A spring 9 having an annular holding portion 10 placed on the upper surface is embedded in the hole 5a. The ball 7a is placed on the holding unit 10 so as to be rotatable. Accordingly, the ball 7 a partially protruding from the surface of the metal plate 6 can be moved downward against the urging force of the spring 9 by being pressed downward.

  As illustrated in FIGS. 5 and 6, a guide groove 3 a is extended on the bottom surface of the segment 3 in a direction in which the segment 3 moves forward and backward with respect to the annular center line CL, and a ball 7 a is fitted in the guide groove 3 a. It is configured to abut. The guide groove 3a has a portion in which the groove depth is increased toward the direction in which the segment 3 moves backward with respect to the annular center line CL. In this embodiment, the groove depth increases in the order of the ranges X, Y, and Z. Ranges X and Z have a constant groove depth, and range Y has a groove inclination and a groove depth changing.

  Hereinafter, the process of clamping the tire mold in the mold open state will be described. First, when the green tire is vulcanized, the segment 3 is moved downward as illustrated in FIG. Since the segment 3 is tilted forward, the tip of the bottom surface of the segment 3 contacts the ball 7a before the segment 3 contacts the surface of the metal plate 6 as illustrated in FIG. Therefore, only the tip of the bottom surface of the segment 3 does not locally contact the surface of the metal plate 6. At this time, the ball 7a is in contact with the range X of the guide groove 3a. By moving the segment 3 downward in this state, the forward tilt of the segment 3 is reduced.

  After the bottom surfaces of the segments 3 are brought into contact with the front and rear balls 7a, the container ring 2 is moved downward as illustrated in FIG. 9, and the segments 3 are moved forward. At this time, the rolling ball 7a is in contact with the range Y of the guide groove 3a.

  Next, the container ring 2 is further moved downward, and the segment 3 is moved forward as illustrated in FIG. At this time, the rolling ball 7a is in contact with the range Z of the guide groove 3a. The tire ring is clamped by moving the container ring 2 downward, sliding the segment 3 on the surface of the metal plate 6 and moving it forward.

  The fitting condition between the guide groove 3a and the ball 7a will be described in detail with reference to FIGS. While the ball 7a is in contact with the ranges X and Y of the guide groove 3a, the bottom surface of the segment 3 is not in contact with the surface of the metal plate 6 as illustrated in FIGS. When the ball 7a contacts the range Z of the guide groove 3a, the bottom surface of the segment 3 contacts the surface of the metal plate 6 as illustrated in FIG. At this time, the forward tilt of the segment 3 is already corrected, and the bottom surface of the segment 3 is in a state parallel to the surface of the metal plate 6.

  Therefore, even if the segment 3 is slid and moved on the surface of the metal plate 6, it is possible to suppress a problem that uneven wear occurs on the surface of the metal plate 6. Along with this, when the tire mold is clamped, a predetermined vertical distance between the molds is secured, so that overflow of rubber from the tire mold during vulcanization can be prevented. Further, the service life of the metal plate 6 is extended, and the maintenance cost can be reduced.

  In the embodiment, the ball 7a (initial contact prevention member) is provided on the surface of the metal plate 6. However, the ball 7a (initial contact prevention member) may be provided on the surface of the bottom plate 5 where the metal plate 6 is not provided. it can.

  In this embodiment, since the pressing force by the segment 3 moving downward is buffered by the biasing member 8, the impact on the metal plate 6 can be further reduced. The urging member 8 can be arbitrarily provided.

  In addition, the guide groove 3a can be arbitrarily provided, but if the guide groove 3a is extended as in this embodiment, the segment 3 (sector mold 11) can be guided without being displaced in a preset direction. As illustrated in FIGS. 12A to 12C, the groove width of the guide groove 3a is not limited to a specification that fits into the ball 7a without any allowance, and is illustrated in FIGS. 13A to 13C. Thus, it can also be made into the specification which has a play allowance. As illustrated in FIG. 13, when the groove width has a play allowance, the wear over time of the guide groove 3a and the ball 7a can be reduced.

  Instead of the ball 7a illustrated in the embodiment, other rotating bodies such as rollers can be adopted. A protrusion or the like that is not a rotating body can also be employed as the initial contact prevention member. In the embodiment, four balls 7 a (initial contact prevention members) are provided for one segment 3, but in order to stably secure the horizontal state of the front, rear, left and right of the segment 3, It is preferable to provide three or more initial contact prevention members.

  As illustrated in FIG. 14, when a protrusion 7 b that protrudes above the surface of the metal plate 6 and does not move downward is provided on the surface of the bottom plate 5 or the metal plate 6, The guide groove 3a illustrated in the embodiment is extended. That is, the guide groove 3a having a portion in which the groove depth is increased toward the direction in which the segment 3 moves backward with respect to the annular center line CL is provided.

  With this configuration, the tip of the bottom surface of the segment 3 comes into contact with the protrusion 7b before the segment 3 that moves forward and tilts downward with respect to the annular center line CL comes into contact with the protrusion 7b. Reduce the tilt. Thereafter, the segment 3 moves forward with the projection 7 b fitted in the guide groove 3 a, and the bottom surface of the segment 3 comes into contact with the surface of the metal plate 6. At this time, since the forward tilt of the segment 3 has already been corrected, even if the segment 3 is slid and moved on the surface of the metal plate 6, uneven wear hardly occurs on the surface of the metal plate 6.

  As illustrated in FIG. 15, when the guide groove 3 a is not provided on the bottom surface of the segment 3, a ball 7 a (initially provided on the surface of the bottom plate 5 or the metal plate 6 and protrudes upward from the surface of the metal plate 6. The contact preventing member is provided by being biased upward. That is, the ball 7a (initial contact prevention member) is configured to be able to move downward and be completely immersed in the surface of the metal plate 6.

  Also in this configuration, before the segment 3 that is inclined downward and moves downward with respect to the annular center line CL contacts the surface of the metal plate 6, the tip of the bottom surface of the segment 3 becomes the ball 7a (initial contact prevention member). In contact with each other, the forward tilt of the segment 3 is reduced. Then, the ball 7 a (initial contact prevention member) is pressed downward by the segment 3 and is completely immersed in the surface of the metal plate 6.

  As a result, the segment 3 whose forward tilt is corrected comes into contact with the surface of the metal plate 6, so that even if the segment 3 is slid and moved on the surface of the metal plate 6, uneven wear hardly occurs on the surface of the metal plate 6.

  Using a tire mold of the same specification using a container (example) having the same configuration as the embodiment illustrated in FIGS. 1 to 12 and a conventional container (conventional example) that does not include an initial contact prevention member. The green tire was vulcanized, and the maximum wear amount and uneven wear amount of the metal plate at that time were measured. The partial wear amount is a value obtained by subtracting the wear amount at the minimum wear portion from the wear amount at the maximum wear portion. The results are shown in Table 1.

  The guideline for replacing the metal plate is that the maximum wear amount is 0.5 mm. Therefore, from the results in Table 1, the number of vulcanizations until the replacement is about 60,000 in the example and about 25,000 in the conventional example. It can be seen that the working life of the example is about 2.5 times that of the conventional example. In addition, it can be seen that the amount of uneven wear when the number of vulcanizations is 20,000 is about 27% (0.07 / 0.26) of the conventional example.

DESCRIPTION OF SYMBOLS 1 Tire vulcanization container 2 Container ring 3 Segment 3a Guide groove 4 Lifting plate 5 Bottom plate 5a Hole 6 Metal plate 6a Through hole 7a Ball (initial contact prevention member)
7b Protrusion (initial contact prevention member)
8 Biasing member 9 Spring 10 Holding part 11 Sector mold 12a Upper side mold 12b Lower side mold CL Annular center line of sector mold

Claims (5)

A segment attached to the outer peripheral surface of each of the plurality of sector molds arranged in an annular shape, a lifting plate to which the upper side mold is attached, a bottom plate to which the lower side mold is attached, and a container ring that moves up and down, The segment is suspended from the elevating plate so as to be slidable in the horizontal direction, and the outer peripheral inclined surface of the segment and the inner peripheral inclined surface of the container ring are slidably engaged with each other, and the container ring moves up and down. In the tire vulcanization container in which a segment is slid on the surface of the metal plate installed on the bottom plate to move the plurality of sector molds forward and backward relative to the annular center line,
The segment that is provided on the surface of the bottom plate or the metal plate with an initial contact preventing member that is biased to protrude upward from the surface of the metal plate, and that moves downward while tilting forward with respect to the annular center line. A container for tire vulcanization, wherein the forward tilt of the segment is reduced by the tip of the bottom surface of the segment abutting against the initial contact preventing member before the segment abuts on the surface of the metal plate.   The container for tire vulcanization according to claim 1, wherein the initial contact member is a rotating body.   3. The guide groove according to claim 1 or 2, wherein a guide groove is extended on a bottom surface of the segment in a direction in which the segment moves forward and backward with respect to the annular center line, and the initial contact member is fitted and abutted on the guide groove. The container for tire vulcanization described.   The tire vulcanization container according to claim 3, wherein the guide groove has a portion whose groove depth is increased in a direction in which the segment recedes from the annular center line. A segment attached to the outer peripheral surface of each of the plurality of sector molds arranged in an annular shape, a lifting plate to which the upper side mold is attached, a bottom plate to which the lower side mold is attached, and a container ring that moves up and down, The segment is suspended from the elevating plate so as to be slidable in the horizontal direction, and the outer peripheral inclined surface of the segment and the inner peripheral inclined surface of the container ring are slidably engaged with each other, and the container ring moves up and down. In the tire vulcanization container in which a segment is slid on the surface of the metal plate installed on the bottom plate to move the plurality of sector molds forward and backward relative to the annular center line,
An initial contact preventing member protruding above the surface of the metal plate is provided on the surface of the bottom plate or the metal plate, and the segment moves forward and backward with respect to the annular center line on the bottom surface of the segment. A guide groove extends in a direction, and the guide groove has a portion whose groove depth is deepened in a direction in which the segment moves backward with respect to the annular center line, and is inclined forward with respect to the annular center line. Before the segment that moves downward contacts the surface of the metal plate, the tip of the bottom surface of the segment contacts the initial contact prevention member to reduce the forward tilt of the segment, and the initial contact prevention member serves as the guide. A container for tire vulcanization characterized by being configured to fit into a groove.

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